Mark W Shephard
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Explore the profile of Mark W Shephard including associated specialties, affiliations and a list of published articles.
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6
Citations
19
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Recent Articles
1.
White E, Shephard M, Cady-Pereira K, Kharol S, Ford S, Dammers E, et al.
Remote Sens (Basel)
. 2025 Jan;
15(10):2610.
PMID: 39748834
Presented is a methodology to explicitly identify and account for cloud-free satellite measurements below a sensor's measurement detection level. These low signals can often be found in satellite observations of...
2.
Toro C, Sonntag D, Bash J, Burke G, Murphy B, Seltzer K, et al.
Atmos Environ (1994)
. 2024 Jun;
327:1-7.
PMID: 38846931
The US Environmental Protection Agency (EPA) estimates on-road vehicles emissions using the Motor Vehicle Emission Simulator (MOVES). We developed updated ammonia emission rates for MOVES based on road-side exhaust emission...
3.
Momeni M, Choi Y, Yeganeh A, Pouyaei A, Jung J, Park J, et al.
Environ Int
. 2024 Feb;
184:108473.
PMID: 38340404
Uncertainty in ammonia (NH) emissions causes the inaccuracy of fine particulate matter simulations, which is associated with human health. To address this uncertainty, in this work, we employ the iterative...
4.
Pai S, Heald C, Coe H, Brooks J, Shephard M, Dammers E, et al.
ACS Earth Space Chem
. 2022 Oct;
6(10):2432-2445.
PMID: 36303716
India experiences some of the highest levels of ambient PM aerosol pollution in the world. However, due to the historical dearth of in situ measurements, chemical transport models that are...
5.
Cao H, Henze D, Zhu L, Shephard M, Cady-Pereira K, Dammers E, et al.
J Geophys Res Atmos
. 2022 Jul;
127(9):e2021JD035687.
PMID: 35865809
We conduct the first 4D-Var inversion of NH accounting for NH bi-directional flux, using CrIS satellite NH observations over Europe in 2016. We find posterior NH emissions peak more in...
6.
Pleim J, Ran L, Appel W, Shephard M, Cady-Pereira K
J Adv Model Earth Syst
. 2021 Mar;
11(9):2934-2957.
PMID: 33747353
Ammonia surface flux is bidirectional; that is, net flux can be either upward or downward. In fertilized agricultural croplands and grasslands there is usually more emission than deposition especially in...